Kanon Town is filled with music. Hibiki Houjou and Kanade Minamino have grown up in this town and have known each other since they were children. However, they no longer get along.
One day the fairy Hummy from the land of music, Major Land, appears before them. The evil king Mephisto of Minor Land is planning to turn the legendary Melody of Happiness into the Melody of Misfortune. To prevent this from happening, Hibiki and Kanade transform themselves into Pretty Cure.